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https://github.com/godotengine/godot
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89 lines
3.4 KiB
C++
89 lines
3.4 KiB
C++
/*
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Convection Texture Tools
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Copyright (c) 2018-2019 Eric Lasota
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject
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to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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-------------------------------------------------------------------------------------
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Portions based on DirectX Texture Library (DirectXTex)
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Copyright (c) Microsoft Corporation. All rights reserved.
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Licensed under the MIT License.
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http://go.microsoft.com/fwlink/?LinkId=248926
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*/
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#include "ConvectionKernels_Config.h"
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#if !defined(CVTT_SINGLE_FILE) || defined(CVTT_SINGLE_FILE_IMPL)
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#include "ConvectionKernels.h"
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#include "ConvectionKernels_ParallelMath.h"
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#include <algorithm>
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namespace cvtt
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{
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namespace Util
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{
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// Signed input blocks are converted into unsigned space, with the maximum value being 254
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void BiasSignedInput(PixelBlockU8 inputNormalized[ParallelMath::ParallelSize], const PixelBlockS8 inputSigned[ParallelMath::ParallelSize])
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{
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for (size_t block = 0; block < ParallelMath::ParallelSize; block++)
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{
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const PixelBlockS8& inputSignedBlock = inputSigned[block];
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PixelBlockU8& inputNormalizedBlock = inputNormalized[block];
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for (size_t px = 0; px < 16; px++)
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{
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for (size_t ch = 0; ch < 4; ch++)
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inputNormalizedBlock.m_pixels[px][ch] = static_cast<uint8_t>(std::max<int>(inputSignedBlock.m_pixels[px][ch], -127) + 127);
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}
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}
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}
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void FillWeights(const Options &options, float channelWeights[4])
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{
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if (options.flags & Flags::Uniform)
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channelWeights[0] = channelWeights[1] = channelWeights[2] = channelWeights[3] = 1.0f;
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else
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{
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channelWeights[0] = options.redWeight;
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channelWeights[1] = options.greenWeight;
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channelWeights[2] = options.blueWeight;
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channelWeights[3] = options.alphaWeight;
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}
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}
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void ComputeTweakFactors(int tweak, int range, float *outFactors)
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{
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int totalUnits = range - 1;
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int minOutsideUnits = ((tweak >> 1) & 1);
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int maxOutsideUnits = (tweak & 1);
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int insideUnits = totalUnits - minOutsideUnits - maxOutsideUnits;
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outFactors[0] = -static_cast<float>(minOutsideUnits) / static_cast<float>(insideUnits);
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outFactors[1] = static_cast<float>(maxOutsideUnits) / static_cast<float>(insideUnits) + 1.0f;
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}
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}
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}
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#endif
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